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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93e38baed433ef873f0f10e4480a9af2d26f49690a5c3b43981640ba297c50a' 
  AND token = 'H66+QA+clSPvSbgYBsliJCD/jMB6pCv4A0tC7A+JHfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}